The mnemonic
Double Quarter Pounder
What each word stands for
- DoubleDisopyramide
- QuarterQuinidine
- PounderProcainamide
Why it matters clinically
Class IA drugs prolong the QT interval and can cause torsades de pointes.
Where it stops being reliable
Covers class IA only, not IB or IC.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.